Namechanged (there is another whattodonow but it's not them it's me, just that I'd better say that to avoid confusion with another poster).
Anyway, I have suspected dh is up to something for some time. I looked at his history on internet and found a site.
I joined this site- I've NO intention of doing anything else bar joining and did not give my details and I won't bore with details of my 'detective' work but- he was extremely easy to find.
He has been specific about what he likes: looking for no strings attached sex, what positions he likes and what he likes sexually.
I am fuming and upset at same time.
Don't know what the heck to do next.